Stove grate



M. J. MCLAINE Jan. 7, 1936.

STOVE GRATE A Filed Nov. 14, 1954 2 Sheets-Sheet 2 Inventof Mi! f M lw/m Attorney Patented Jan. 7, 1936 UNITED STATES PATENT OFFICE STOVE GRATE Michael Joseph McLaine, Dunmore, Pa.

Application November 14, 1934, Serial No. 753,031

2 Claims.

This invention relates to that field of invention referred to broadly as stoves and furnaces and it has more specific reference to a novel stove grate which is particularly, but not necessarily, designed for use in connection with a coal burning stove.

Being reasonably well conversant with the state of the art to which the invention relates I am well supported in stating by way of introduction that the specific field. to which the invention relates is. characterized by numerous types and forms of coal grate constructions. As a matter of fact, it is generically old in this particular line of endeavor to provide a frame formed with a plurality of complemental bladed or lug equipped bars having coacting cog wheels and means for rotating said bars for the purpose of shaking andadjusting.

Notwithstanding this state of development of the prior art, I believe that I have evolved and produced an appreciably different type of grate construction which constitutes a novel contribution to the art and trade and which, it is believed, is equipped with features which transcend in importance and efficiency of seemingly equivalent means in analogous patents.

My primary aim is to generally improve upon these known grate constructions by providing a structure possessing the essential requisites of simplicity and economy and at the same time notable as an improvement in that the grate bars or units are so made and assembled as to permit the bed of fire to be churned or bodily heaved up for the purpose of reversing or turning the grate bars over to promote longevity and to decidedly reduce the likelihood of destruction by burning out.

Other features and advantages will become more readily apparent from the following description and drawings.

In the drawings:

Figure 1 is a top plan view of the complete grate structure developed in accordance with the principles of the present invention.

Figure 2 is an end View which may be conveniently designated as a front end elevation of the structure illustrated in Figure 1.

Figure 3 is a central longitudinal sectional view taken approximately on the plane of the line 3-3 of Figure 1. I

Figure 4 and 5 are transverse sections, or views at right angles to: Figure 3, the sections being on the lines 4-4 and 5--5, respectively, of Figure 1.

Referring now to the drawings by distinguishing reference numerals it will be observed that 6 denotes, as a unit, the one piece or single cast metal frame. This is of general rectangular form and includes a pair of duplicate spaced parallel side rails I and a pair of depending end rails 8. The upper edges of the end rails are disposed substantially flush with the lower edges of the side rails l and are formed with keeper notches 9 as shown in Figure 5. Superimposed upon the end rails are retaining bars I which fit between the side rails and which have extensions H on their ends fitting into retaining notches I2 in the end portions of said side rails l. The extensions are fastened in place by bolts I3. It will be noticed in Figure that on its bottom each bar I0 is provided with lugs [4 which are shaped to fit down into the notches l2 so as to cooperate with said notches in defining bearings. Along the inner edges of the side bar are longitudinally spaced inwardly projecting plate-like members I5 which serve as the relatively fixed grate elements. The upper edges [6 of these are beveled downwardly and the lower edges depend below the bottom faces of the side bars 1 (see Figure 4).

Referring now to Figure 1 it will be observed that the numerals l1, I8 and I9 designate the revoluble grating means frequently referred to as the grate bars but here referred to as the revoluble grate sections or units. These are arranged in the triple relationship depicted in Figure 1 so as to provide the desired nested formation defining the open work grid or grille for the fire bed. Each unit includes a central bar 20 having its end portions formed into cylindrical journals or trunnions 20a rotatably mounted in the aforementioned bearings. The central unit has one of its trunnions provided with an extension 2| which is of fiat faced form to accommodate a turning crank. At corresponding ends the grate units are provided with intermeshlng cog Wheels or gears 22, 23 and E l, respectively, which serve to rotate said sections in unison. That is to say the sections are geared together so that they are revolved as a unit when the customary hand crank (not shown) is employed. The main thing to be noted about these units is that they are provided with ingenious grid plates. Each plate is the same in construction and is denoted by the numeral 25 in Figure 4. That is to say each plate is of appropriate thickness and of general oval outline, the central edge portions thereof being notched so as to decrease the width of the mid-portion and to define a pair of duplicate end wings or blades 26. It follows therefore that in end View these blades cooperate in defining an element which resembles a propeller blade. It is evident, therefore, that as the between the complementary fixed grate members Of most importance is the arrangement of. the propeller-shaped blades 26 which because of their particular configuration serve to define a dependable grate for supporting the bed of fire. This arrangement makes it possible to reverse the grate with little or no trouble, thereby ensuring long life and dependability. The narrowed or notched portions of the grate plates or blades provide full free air circulation ensuring a good fire and preventing needless ruination of the coal supporting surfaces of the blades.

It is thought that persons skilled in the art to which the invention relates will be able to obtain a clear understanding of the invention after considering the description in connection with the drawings. Therefore, a more lengthy description is regarded as unnecessary.

Minor changes in shape, size, and rearrangement of. details coming within the field of invention claimed may be resorted to in actual practice, if desired.

What is claimed is:

1. A grate of the class described comprising a frame, a plurality of parallel bars journaled in the 5 frame, and spaced substantially oval-shaped blades attached to each bar, each blade having plain rounded ends and an inwardly extending arcuate-shaped recess in each side edge, the blades of adjacent bars being staggered and disposed in nested relation to form an open-work fire supporting grid with a wavy upper surface.

2. In a grate construction of the class described, a substantially rectangular frame having end members provided with bearings, the side members being formed with integral downwardly beveled plate members arranged in longitudinally spaced parallelism, said plate members projecting into the area of said frame, a series of complemental grate bars having trunnions mounted for rotation in said bearings, each grate bar being provided with oval-shaped blades having inwardly directed arcuate-shaped central side edge portions, and rounded end portions, the blades of said bars being staggered and disposed in nested relation, and the blades of the bars adjacent said side members being staggered with respect to the beveled plate members of said side members.

MICHAEL JOSEPH McLAINE. I0 

